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US 4,668,533 AGranted
Ink jet printing of printed circuit boards
AssigneeE. I. Du Pont de Nemours and Company
InventorJoel S. Miller
Life of this patent
Estimating the term…
Abstract
Imagewise deposition of ink onto a substrate such as a circuit board, by ink jet technology, to produce a metal-imaged circuit board.
Claims16
An improved process for preparing printed circuit board wherein the improvement consists essentially of:
- (i) depositing a water-based ink comprising a first metal on a substrate in a predetermined pattern by the ink jet process, and
- (ii) depositing on said substrate, by electroless deposition, a second metal having a reduction potential equal to or more positive than that of the first metal, said second metal depositing in a pattern substantially congruent to that formed in step (i).
An improved process for preparing a printed circuit board wherein the improvement consists essentially of:
- (i) depositing a water-based ink comprising a sensitizer for image sensitization on a substrate in a predetermined pattern by the ink jet process,
- (ii) treating the sensitized substrate of step (i) with a metal which is reduced by the sensitizer, and
- (iii) depositing on said substrate, by electroless deposition, a metal having a reduction potential equal to or more positive than that of the metal employed in step (ii), said metal depositing in a pattern substantially congruent to that formed in step (ii).
Dependencies are inferred from the claim text.